Load Line Markings for Ocean-going Vessels

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The American Bureau of Shipping is authorized to assign Load Lines to vessels registered in the United States and other countries. Requests for the assignment of Load Lines are to be made on forms which will be furnished by one of the offices of ABS.
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The center of the ring is to be placed on each side of the vessel at the middle of the length, as defined in the Load Line Regulations. The ring and lines are to be permanently marked, as by center punch, chisel cut or bead of weld.
AB American Bureau of Shipping
TF Tropical Fresh Water Allowance 
F Fresh Water Allowance 
T Load Line in Tropical Zones
S Summer Load Line 
W Winter Load Line 
WNA Winter North Atlantic Load Line 

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